When I was trainspotting in Leeds during the late 1960s we always looked forward to seeing the long-distance trains from Cardiff or Swansea arrive as they would often turn up a "cop" Class 47, even better often a namer. We hoped vaguely to one day see a Western being rostered for this duty but of course if they ever were they would be switched for a diesel-electric at Birmingham, so we never did.
But on 20th January 1977 unbelievably D1013 Western Ranger did the entire journey on the 07:30 Swansea to Leeds and returned from Leeds in service the same day. The loco was withdrawn the following month. I never saw a hydraulic anywhere near Leeds, although Hull Dairycoates were saddled with dozens of the D9500 class 1s as a replacement for their steam in 1967. They didn't last long either.
A few years earlier a "Hall" had been rostered on a football special to Huddersfield, whether this was a substitute or not I don't know but it was out of gauge and damaged its cylinders at Denby Dale. Spotters loved such instances but I think the operating departments were rightly very wary of letting strange monsters from the Western Region on their metals.